Clearance gauge



Sept. 15, 1925.

J. V. ROMIG CLEARANCE GAUGE Filed Oct. 17. 1923- 2 Sheets-Sheet l J. v. ROMIG CLEARANCE GAUGE Sept. 15, 1925. 1,553,878

Filed Oct. 17, 1923 2 Sheets-Sheet 2 Erik. 1 E515- gwwnlow Patented Sept. 15, 1925.

JOSEPH V.

PATENT r OFFICE.

ROMIG, ALLENTOWN, PENNSYLVANIA, ASSIGNOR TO BROWN &, SHARPE MANUFACTURING COMPANY, OF PROVIDENCE, RHODE ISLAND.

. CLEARANCE GAUGE.

g Application filed October 17, 1923. Serial No. 669,169.

Toall'whomz't may concern: I

Be it known that I,"JosErH, V; RoMIG, a citizen of the United States, residing at Allentown, in the county of-Lehigh and State of -Pennsylvania,; have invented new and useful Improvements in a Clearance -G'auge, of which thefollowing is a specification.-

i r s This invention relates to certainfnew and l useful improvements in a clearance gauge and more especially in a gauge for'measuring the clearance of the teeth. ofm lllng cutters and the like. 1

Thewobject of the invention is to provide a simplified and practical tool of this character which may be economically produced thereby permitting a low sales cost so that every operator of milling cutter grinders may easily equip himself with a gauge. I

The invention resides in a protractor device slidably and frictionally mounted on a bar for being moved therealong against. a cutter tooth, the protractor device being itself adjustable for determining the angle of clearance. I v

The invention will also be found to reside in the salient features of'construction. and,

the gauge; and Figure 6 is a transverse section on line 6 6 of Fig. 4:.

Referring more in detail to the accompanying drawings, the numeral 1 designates a bar-like bodyhaving one end formed into a laterally enlarged head 2 whose outer edge is cut out, as at 3, to form a seat to receive the arbor of the cutter to be operated on.

The seat 3, has two inwardly converging side walls which meet at a point in alinement with the adjacent side edge of the body 1, as is clearly seen in Figures 1 and 1.

Thus, the edge of the body will be brought into radial alinement with the arbor, and the cutter thereon.

"A slide 4 ismounted on the body and is opposingedge wall of the slide which latter wall is centrally depressed to receive an .elbow bend of the spring, as indicated at 6,

to secure the spring against accidental displacement. The opposite edges of the slide are serrated or roughened, at 7 to facilitate radj'ustlng the slide with the, fingers.

One side of the slide has a forwardly extending ear 8 and a rearwardly extending dial 9 provided with graduations depressed in its ace.

A clearance measuring device is pivoted at 10 on the ear 8 and has a stop 11 and an angular blade 12 on one side defining a tooth-receiving recess,-and a needle arm or finger 13 extending from the pivot to operate over the dial, the extreme end being curved to resiliently engage or click into the, graduations to hold the blade 12 in a'set position, as shown in Fig. 5. v

In operation, after the cutter 15 has been placed in the grinding machine on the arbor or mandrel 14, and a trial pass made over one tooth 16 by the grinding wheel, the tooth is then rotated around to the vertical position, as indicated in Figure 4. The gauge 7 is then set with its head 2 seated on the arbor, as in Figures 1 and 4, and the slide 4 moved down to bring the notch or stop 11 over and into engagement with the tooth. The blade 12, in zero or normal position, is tangent to the cutter 15 and in order to bring. the blade into fiat engagement with the peripheral edge 17 of the tooth to measure'its clearance, the point of arm 13 is moved over the dial from which the angle of clearance may be easily read from the dial in degrees from the tangent. The clearance angle is then checked to the accurately checked protractor and, if incorrect, the finger or arm is elevated or lowered to the correct position.

In this manner the correctness of the angle is checked on the very first tooth ground; As the. blade 12 at zero position is tangent to the cutter, the readings on the .I claim as new and desire to dial will be in degrees of angularity to the tangent point.

The tool has been designed in its simplest and most useful form enabling every grinder hand or user to have one because of its low cost of manufacture. vTheprotractor is accurately set by reason of the finger point clicking into the'dial graduations.

The frictional spring mounting of the slide permits an easy sliding action Without play and eliminating the use of a set screw. The head 2 is so shaped to squarely seat on the mandrel of various sizes, as indicatedrin Figure 1.

Having thus described my inventiomwhat secure by Letters Patent is: 1

1, A clearance gauge comprising a bar,

a slide thereon, a clearance measuring de- -v1ce p1'voted on the slide and having a toothreceiv ng recess spaced from the pivotal mounting for receiving the cutting edge of the toothto be gauged, the recess of said device having one Wall forming a stop to bejabutted by thetooth and another Wall for engaging the clearance face of the tooth,

and means for indicating the degree of clearance.

2. A clearancegauge comprising-a bar, a slide thereon,- and a clearance gauge device pivoted on the slide and formed with a tooth-receiving recess having one Wall constituting an angular clearance blade extending therefrom and an adjacent wall constituting a stop.

3. A clearance gauge comprising a support, a slide;,thereon, a dial on the slide having depressed graduations, and a clearance measuring device supported on the slide for movement, said device having a pointer operating over the dial and interlocking with; thev graduations thereof.

4. In a clearance gauge, a support, a clear- I ance measuring device movably mounted on the support and having a tooth-receiving notch one Wall of which constitutes a clearance blade leading therefrom, and means fordetermining or indicating the degrees of clearance.

Intestimony whereof I have signed my name to this specification.

' JOSEPH V. ROMIG. 

